CVE-2026-54287

Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice

State: Published
Severity: 5.3 Medium
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: Jun 12, 2026

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Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes (for example Expires dates), clients cannot split the value back into individual cookies and silently drop or misparse them. This vulnerability is fixed in 4.12.25.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-116 Improper Encoding or Escaping of Output

Affected Products

Product	Versions
honohonojs	< 4.12.25Affected

References

https://github.com/honojs/hono/security/advisories/GHSA-j6c9-x7qj-28xf

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